Find the most up-to-date version of ASTM E at Engineering Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination. Contact us. Purchase your copy of ASTM E – 17 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.

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Other applications of macroetching include: Other rating methods may be established per agreement between the user and producer.

Macroetch Examinations

Link to Active This link will always route to the current Active version of the standard. Remove the smut that forms on the specimen surface by scrubbing the surface with a stiff brush under hot running water. The usual procedure is to take a roughing cut, then a? Copyright Compu-tecture, Inc. A nickel-molybdenum alloy can be used for containing solutions of sulfuric or hydrochloric acid, or both.

Evaluation of machined parts for grinding cracks in tools and dies. The etching solution should ashm clear and free from scum. Maintain a sufficient volume of solution in the vessel to cover the specimen with a layer of at least 25 mm 1 in.

Precision and Bias With reductions over a 3: The solution should be swabbed on the? Splash is normally associated with molten steel which solidi?


Adjunct to E Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings – ADJE

Dark center is solid material and should not be confused with center unsoundness. Current edition approved Oct.

E — 01 5. Some conditions related to the cast structure for example, chill zone and columnar structure may not be discernible in product which has been reduced by rolling and forging while pattern is only discernible in a wrought specimen.

Sulfur printing shall be performed in accordance with Practice E Steels react differently to etching reagents because of variations in chemical composition, method of manufacture, heat treatment and many other variables. The name implies that the etched surface is examined visually, or at low magni? The specimen should not be blotted dry. Overetching can lead to misinterpretation. In most cases, 15 to 30 min will be sufficient for hot-acid etching.

Sufficient torch cut astn should be removed by cold cutting to eliminate the thermal effects of torch cutting.

It may be necessary to use solvents to clean the surface. Development of grain flow in a forged asm or fastener, which is a critical property for the integrity of the forging.

They are also known as shatter cracks or hairline cracks. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.


Grinding, which also may be used, is usually conducted in the same manner, using free-cutting wheels and light feeds. The type of condition present may be identi? E31 ingot cast product, the specimen is usually taken after ingot breakdown.

The method is limited in application to bars, billets, blooms, and forgings of carbon and low alloy steels. Enter your account email address to request a password reset: The sectioning of the large specimens should be done so as not to disturb the central portion of the section. The hydrochloric acid need not be reagent grade.

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ASTM E381 – 17

Mix solutions and macroetch under a fume hood. The most common reagent for macroetching iron and steel is sstm 1: Continuously cast steel blooms and billets, in the as cast condition, shall be examined according to the procedures described in Sections 10 and The acids are strong and they can cause serious chemical burns.

NOTE 1—The addition of hydrogen peroxide H2O2 may be necessary in order to provide sufficient reaction to properly etch some types of product.